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WM8976CGEFL/V 데이터시트(PDF) 55 Page - Wolfson Microelectronics plc

부품명 WM8976CGEFL/V
상세설명  Stereo CODEC with Speaker Driver
PDF  114 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8976CGEFL/V 데이터시트(HTML) 55 Page - Wolfson Microelectronics plc

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Production Data
WM8976
w
PD, Rev 4.5, November 2011
55
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R52
LOUT1
Volume
control
7
LOUT1ZC
0
Headphone volume zero cross
enable:
1 = Change gain on zero cross only
0 = Change gain immediately
6
LOUT1MUTE
0
Left headphone output mute:
0 = Normal operation
1 = Mute
5:0
LOUT1VOL
111001
Left headphone output volume:
000000 = -57dB
...
111001 = 0dB
...
111111 = +6dB
8
HPVU
Not latched
LOUT1 and ROUT1 volumes do not
update until a 1 is written to HPVU
(in reg 52 or 53)
R53
ROUT1
Volume
control
7
ROUT1ZC
0
Headphone volume zero cross
enable:
1 = Change gain on zero cross only
0 = Change gain immediately
6
ROUT1MUTE
0
Right headphone output mute:
0 = Normal operation
1 = Mute
5:0
ROUT1VOL
111001
Right headphone output volume:
000000 = -57dB
...
111001 = 0dB
...
111111 = +6dB
8
HPVU
Not latched
LOUT1 and ROUT1 volumes do not
update until a 1 is written to HPVU
(in reg 52 or 53)
Table 40 OUT1 Volume Control
Headphone Output using DC Blocking Capacitors:
DC Coupled Headphone Output:
Figure 29 Recommended Headphone Output Configurations
When DC blocking capacitors are used, then their capacitance and the load resistance together
determine the lower cut-off frequency, fc. Increasing the capacitance lowers fc, improving the bass
response. Smaller capacitance values will diminish the bass response. Assuming a 16
 load and C1,
C2 = 220
F:
fc = 1 / 2 RLC1 = 1 / (2 x 16 x 220F) = 45 Hz



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